US6192769B1 - Adjustable gearhead for a hedge trimmer attachment - Google Patents

Adjustable gearhead for a hedge trimmer attachment Download PDF

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Publication number
US6192769B1
US6192769B1 US09/204,995 US20499598A US6192769B1 US 6192769 B1 US6192769 B1 US 6192769B1 US 20499598 A US20499598 A US 20499598A US 6192769 B1 US6192769 B1 US 6192769B1
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US
United States
Prior art keywords
shaft
clamping
housing part
hedge trimmer
trimmer according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US09/204,995
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English (en)
Inventor
Thomas Stark
Stephan Ostendorf
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Assigned to ANDREAS STIHL AG & CO. reassignment ANDREAS STIHL AG & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OSTENDORF, STEPHAN, STARK, THOMAS
Application granted granted Critical
Publication of US6192769B1 publication Critical patent/US6192769B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/04—Apparatus for trimming hedges, e.g. hedge shears
    • A01G3/047—Apparatus for trimming hedges, e.g. hedge shears portable
    • A01G3/053—Apparatus for trimming hedges, e.g. hedge shears portable motor-driven
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18056—Rotary to or from reciprocating or oscillating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1956—Adjustable
    • Y10T74/19565—Relative movable axes
    • Y10T74/1957—Parallel shafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19642—Directly cooperating gears
    • Y10T74/19688—Bevel

Definitions

  • the present invention relates to a gearhead assembly of a drive shaft and a output shaft, especially of a hedge trimmer attachment for a trimmer, in which the output shaft is arranged in a second housing part and is positioned laterally displaced to the drive shaft positioned in a first housing part.
  • a central gear is positioned between the drive shaft and the output shaft and is secured on a bearing shaft extending perpendicularly to the drive shaft and the output shaft.
  • the bearing shaft is positioned with one end in the first housing part and with the other end in the second housing part.
  • the second housing part together with the output shaft is pivotable in a plane parallel to the drive shaft relative to the first housing part about the bearing shaft.
  • Such a gear head assembly is known from German Patent Application 41 16 885.
  • the drive shaft is supported in a first housing part which is connectable to the free end of the guide tube of a trimmer.
  • a second housing part is rotatably secured which houses the output shaft.
  • a central gear wheel is provided in the housing between the drive shaft and the output shaft which is secured on a transversely extending bearing shaft secured with one end in the first housing part and with the other end in the second housing part.
  • the bearing shaft intercepts at a right angle the imaginary axes of rotation of the drive shaft and the output shaft whereby the second housing part with the output shaft is pivotable relative to the first housing part about the bearing shaft in a plane which extends parallel to the drive shaft.
  • a catch device is provided between the first housing part and the second housing part.
  • the catch device is embodied as a toothed catch curve which cooperates with a matching multi-tooth catch lever.
  • One problem of such a catch device is that play usually results between the catch lever and the catch curve which may result in shaking and knocking of the tool resulting from the drive moments acting on the gearhead.
  • an adjustable gearhead in connection with a hedge trimmer attachment
  • arranged at the lower end of a long guide tube of a trimmer such shaking movements resulting from the drive moments are very disruptive and prevent a fatigue-free, precise guiding of the tool.
  • the bearing shaft is embodied as a hub and the hub is penetrated by the clamping shaft of a clamping device, whereby the clamping shaft with its ends engages the two housing parts.
  • the arrangement of a clamping device coaxially to the pivot axis allows for a force-locking connection of the adjustable housing parts. This ensures that drive moments are securely supported, and vibrations, knocking, etc. of the tool are prevented.
  • the clamping device may be adjustable such that for adjusting the clamping force can be significantly reduced or even canceled. When a predetermined clamping force is fixedly adjusted, it is selected such that it can be overcome upon movement of one housing part by the required adjusting force with acceptable force expenditure.
  • the central gear is comprised of two bevel gears that are connected to one another such that they rotate with one another whereby one bevel gear has an elongate hub extension which engages the other bevel gear so as to rotate therewith.
  • One of the bevel gears is axially moveable relative to the other so that possible axis spacing tolerances can be easily compensated.
  • a spring especially a coil spring, is arranged with which in any pivot position, independent of possibly present manufacturing tolerances, a complete engagement of the central gear at the drive shaft and the output shaft is ensured.
  • a mechanical form-locking (positive-locking) catch device is provided between the housing parts.
  • the catch device can be comprised of a catch curve having catch openings and of a catch pin that is radially moveable relative to the catch curve.
  • FIG. 1 is a plan view of the inventive gearhead assembly as a hedge trimmer attachment for a trimmer
  • FIG. 2 is a side view of the gearhead assembly of FIG. 1, partially in section;
  • FIG. 3 shows a section of the gearhead assembly of FIG. 1 with a quick clamping device
  • FIG. 4 shows a section of the gearhead assembly according to FIG. 3 with a clamping bolt
  • FIG. 5 shows a section of the central gear
  • FIG. 6 shows an end view of the central gear according to FIG. 5 .
  • the gearhead 1 represented in the drawings serves as a connection between a drive shaft 2 and a output shaft 5 laterally staggered to the drive shaft 2 .
  • the drive shaft 2 is supported in a first housing part 4 and the output shaft 5 is supported in a second housing part 3 .
  • the first housing part 4 is positioned on the lower end of a shaft tube 6 which may be the end of a guide tube of a known trimmer.
  • the second housing part 3 is connected with the drive housing 7 of a blade bar 8 of a hedge trimming attachment.
  • the axis 9 of the output shaft 5 extends perpendicularly to the plane defined by the blade bar 8 .
  • the drive shaft 2 and the output shaft 5 are rotatably supported by arrangement of respective roller bearings 11 and 12 in the respective housing parts.
  • a central gear 13 is arranged which in the shown embodiment is a double bevel gear.
  • One of the bevel gears 14 meshes with the drive bevel gear 15 of the drive shaft 2 while the other bevel gear 16 of the double bevel gear 13 meshes with the output bevel gear 17 of the output shaft 5 .
  • the central gear 13 is rotatably supported on a bearing shaft 18 .
  • the central gear 13 is arranged with needle bearings 19 on the bearing shaft 18 .
  • the bearing shaft 18 is a hollow hub, preferably a bearing tube, which with its ends 20 , 21 is received in bushing-like receiving elements 22 of the housing parts 3 and 4 .
  • the end faces 23 of the ends 20 and 21 rest with axial spacing to the bottom 24 of the receiving elements 22 .
  • Adjacent thereto an annular surface 26 of the second housing part 3 rests at an annular flange 27 of the first housing part 4 .
  • a cylindrical neck 25 of the housing part 4 engages a corresponding coaxial receiving element 28 of the second housing part 3 .
  • the neck 25 is coaxially arranged to the bearing tube 18 .
  • a seal 29 is provided which protects the two housing parts against introduction of dirt and loss of lubricant.
  • the first housing part 3 is pivotable about the bearing tube 18 and the cylindrical neck 25 relative to the first housing part 4 whereby the pivot axis 30 intercepts the axis of rotation 9 of the output shaft 5 as well as the axis of rotation 31 of the drive shaft 2 at a right angle.
  • the output shaft 5 together with the second housing part 3 is pivotable in a plane 33 which is parallel to the drive shaft 2 relative to the first housing part 4 about the bearing tube 18 .
  • a clamping device 32 is provided which, in the shown embodiment according to FIG. 3, is a quick clamping device, while in the embodiment according to FIG. 4 it has an adjustable clamping bolt.
  • the clamping shaft 34 penetrates the bearing shaft 13 and with its end is secured in the housing parts 3 and 4 .
  • a clamping nut 35 is threaded which is supported by a pressure disk 36 externally at the housing part 3 .
  • the other end of the clamping shaft 34 supports a clamping lever 37 having an eccentric clamping head 38 which is supported in a ball socket 39 penetrated by the clamping shaft 34 .
  • the ball socket 39 is supported with interposition of a pressure disk 40 externally at the first housing part 4 .
  • a clamping bolt 34 ′ is provided instead of the quick clamping device which the bolt 34 ′ is fixedly clamped in position.
  • One end is embodied as a head 38 ′ and is preferably supported by a spring element 39 ′ on the pressure disk 40 .
  • the other end with the clamping nut 35 is supported on the pressure disk 36 .
  • the clamping nut 35 is tightened so that the applied clamping force of desired magnitude will clamp the housing parts 3 and 4 in a force-locking manner to one another.
  • the clamping force is selected such that it can be overcome by a positional change of the housing parts to one another.
  • the plate spring 39 ′ expediently positioned between the head 38 ′ and the pressure disk 40 , ensures a light adjustment with substantially unchanged axial clamping force.
  • the clamping nut 35 can be covered for securing purposes by a housing cover 35 ′.
  • a catch device is positioned between the first housing part 4 and the second housing part 3 .
  • This catch device is comprised of a catch pin 42 and a catch curve 43 having catch openings 44 .
  • the catch curve 43 is comprised, as can be seen in FIG. 1, of a piece of sheet metal that is curved in the shape of a quarter circle and is secured approximately coaxially to the receiving element 28 at a securing flange 45 of the second housing part 3 .
  • the catch sheet metal piece can be manufactured easily by stamping.
  • the catch openings 44 are arranged equidistantly in the circumferential direction (FIG. 1 ).
  • the catch pin 42 is secured in a housing extension 46 of the first housing part 4 which covers the catch curve 43 and is forceloaded by a spring, especially a coil spring 47 , into its catch position shown in FIG. 3 .
  • the head 48 of the catch pin 42 extends from the housing extension 46 at a side facing away from the catch curve and is fixedly connected to an actuator sleeve 49 which is axially moveably secured (double arrow 50 ) on the shaft tube 6 .
  • a grip 51 is secured which is positioned at the side facing the first housing part 4 substantially parallel to the tool, i.e., the blade bar 8 . Any other arrangement of the grip 51 may be expedient.
  • the clamping lever 37 is positioned in the longitudinal direction of the blade bar 8 behind a protective flange 52 so that a safety means is provided against accidental release of the clamping lever.
  • the catch pin 42 can be embodied with a tapered, preferably conical, head which engages without play a matching catch opening.
  • the operator will adjust the device.
  • the clamping lever 37 is released so that the frictional connection between the first and the second housing parts 3 and 4 is canceled.
  • the operator with his free hand will grip the longitudinal grip 51 and pull with the other hand the actuator sleeve 49 in the longitudinal direction of the shaft tube 6 in the upper direction so that the catch pin 42 will be lifted out of the corresponding catch opening 44 .
  • the operator can then adjust the blade bar relative to the shaft tube 6 about an angular distance of 90°.
  • FIG. 2 one end position is shown in which the longitudinal axis 53 of the shaft tube 6 is approximately parallel to the blade bar 8 .
  • FIG. 2 one end position is shown in which the longitudinal axis 53 of the shaft tube 6 is approximately parallel to the blade bar 8 .
  • the other end position of the pivot range is shown in which the longitudinal axis 53 of the shaft tube 6 is approximately perpendicular to the blade bar 8 .
  • the operator will release the actuator sleeve 49 .
  • the force of the coil spring 47 will force the catch pin 42 into the neighboring catch opening 44 .
  • the catch device 41 serves only as an initial alignment means for of the parts relative to one another. A play-free locking of the housing parts relative to one another is not required so that the catch device 41 can be relatively simple and robust.
  • the final securing of the housing parts 3 and 4 of the adjusted gearhead 1 is carried out by closing the quick clamping device 32 which results in a force-locking connection between the annular surface 26 and the annular flange 27 .
  • the bearing tube 18 can be dimensioned with regard to its length such that for a closed clamping device 32 it is substantially free of axial forces so that the bearing tube 18 serves only as a guide for the central gear 13 and is not subjected to mechanical or dynamic loading.
  • the central gear 13 is comprised of two individual bevel gears which are connected to one another so as to rotate with one another whereby, however, one bevel gear 16 can be axially moved relative to the other bevel gear 14 .
  • one of the bevel gears 14 has an elongate hub extension 54 which is engaged at the center of the other bevel gear 16 so as to rotate therewith. As can be seen in FIG.
  • a splint shaft connection 55 is selected in order to provide a rotationally fixed connection between the hub extension 54 of the bevel gear 14 and the bevel gear 16 which is axially moveably positioned on the hub extension 54 .
  • the bevel gears 14 and 16 have positioned thereat a spring 56 , embodied preferably as a coil spring surrounding the elongate hub extension 54 that forces the bevel gears 14 , 16 apart.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Forests & Forestry (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
US09/204,995 1997-12-02 1998-12-02 Adjustable gearhead for a hedge trimmer attachment Expired - Lifetime US6192769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19753361 1997-12-02
DE19753361A DE19753361C2 (de) 1997-12-02 1997-12-02 Getriebekopf zwischen einer Antriebswelle und einer Abtriebswelle

Publications (1)

Publication Number Publication Date
US6192769B1 true US6192769B1 (en) 2001-02-27

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Application Number Title Priority Date Filing Date
US09/204,995 Expired - Lifetime US6192769B1 (en) 1997-12-02 1998-12-02 Adjustable gearhead for a hedge trimmer attachment

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US (1) US6192769B1 (de)
JP (1) JP3080614B2 (de)
DE (1) DE19753361C2 (de)
FR (1) FR2771784B1 (de)
GB (1) GB2331909B (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050262696A1 (en) * 2004-05-27 2005-12-01 Matsushita Electric Works, Ltd. Personal Trimming system
US20070000138A1 (en) * 2005-06-30 2007-01-04 Baskar Ashok S Portable trimmer having rotatable power head
US20070193038A1 (en) * 2004-05-14 2007-08-23 Husqvarna Ab Device for a pole hedge cutter or the like
WO2013170396A1 (zh) * 2012-05-15 2013-11-21 Wang Yunhua 一种高枝剪的驱动断路机构
US10375896B2 (en) 2016-04-21 2019-08-13 Black & Decker, Inc. Pole hedge trimmer
US11179836B2 (en) 2012-05-31 2021-11-23 Black & Decker Inc. Power tool having latched pusher assembly
US11284568B2 (en) 2018-05-23 2022-03-29 Milwaukee Electric Tool Corporation Hedge trimmer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4610270B2 (ja) * 2004-09-15 2011-01-12 リョービ株式会社 刈払い装置
JP4963862B2 (ja) * 2006-04-27 2012-06-27 落合刃物工業株式会社 高枝刈機
DE102016008935A1 (de) 2016-07-21 2018-01-25 Andreas Stihl Ag & Co. Kg Arbeitsgerät mit über ein Schwenkgelenk verbundenen Teilgehäusen
CN114142671B (zh) * 2021-11-30 2022-12-06 金龙机电（东莞）有限公司 轴向充磁双自由度高频振动装置及电动牙刷

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US511966A (en) * 1894-01-02 Hair-clipping machine
US558973A (en) * 1896-04-28 Cupping-machine
US1839009A (en) * 1930-11-07 1931-12-29 William R Bankson Hedge trimmer
US1857342A (en) * 1930-03-12 1932-05-10 Charles A Albrecht Hedge cutter
US1937586A (en) * 1931-12-30 1933-12-05 Elwood K Ortt Hedge trimmer and the like
DE4116885A1 (de) 1990-06-06 1991-12-12 Kioritz Corp Handschneidgeraet fuer den gartenbau mit zwei relativ zueinander bewegten messerbalken
US5165720A (en) * 1990-11-09 1992-11-24 Ecia Device for fixing in position an adjustable steering column of an automobile vehicle

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB884387A (en) * 1959-12-02 1961-12-13 Heli Strand Tools Ltd A rotary drive control unit for portable power driven tools

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US511966A (en) * 1894-01-02 Hair-clipping machine
US558973A (en) * 1896-04-28 Cupping-machine
US1857342A (en) * 1930-03-12 1932-05-10 Charles A Albrecht Hedge cutter
US1839009A (en) * 1930-11-07 1931-12-29 William R Bankson Hedge trimmer
US1937586A (en) * 1931-12-30 1933-12-05 Elwood K Ortt Hedge trimmer and the like
DE4116885A1 (de) 1990-06-06 1991-12-12 Kioritz Corp Handschneidgeraet fuer den gartenbau mit zwei relativ zueinander bewegten messerbalken
US5079841A (en) * 1990-06-06 1992-01-14 Kioritz Corporation Clipper-type bush cutter
US5165720A (en) * 1990-11-09 1992-11-24 Ecia Device for fixing in position an adjustable steering column of an automobile vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070193038A1 (en) * 2004-05-14 2007-08-23 Husqvarna Ab Device for a pole hedge cutter or the like
US8539678B2 (en) * 2004-05-14 2013-09-24 Husqvarna Ab Device for a pole hedge cutter or the like
US20050262696A1 (en) * 2004-05-27 2005-12-01 Matsushita Electric Works, Ltd. Personal Trimming system
US20070000138A1 (en) * 2005-06-30 2007-01-04 Baskar Ashok S Portable trimmer having rotatable power head
US7752760B2 (en) 2005-06-30 2010-07-13 Black & Decker, Inc. Portable trimmer having rotatable power head
US7930833B2 (en) 2005-06-30 2011-04-26 Ashok Samuel Baskar Portable trimmer having rotatable power head
WO2013170396A1 (zh) * 2012-05-15 2013-11-21 Wang Yunhua 一种高枝剪的驱动断路机构
US11179836B2 (en) 2012-05-31 2021-11-23 Black & Decker Inc. Power tool having latched pusher assembly
US10375896B2 (en) 2016-04-21 2019-08-13 Black & Decker, Inc. Pole hedge trimmer
US11284568B2 (en) 2018-05-23 2022-03-29 Milwaukee Electric Tool Corporation Hedge trimmer

Also Published As

Publication number Publication date
DE19753361A1 (de) 1999-06-17
JPH11225576A (ja) 1999-08-24
FR2771784A1 (fr) 1999-06-04
GB2331909A (en) 1999-06-09
DE19753361C2 (de) 1999-10-14
GB9826190D0 (en) 1999-01-20
JP3080614B2 (ja) 2000-08-28
GB2331909B (en) 2003-02-26
FR2771784B1 (fr) 2002-12-27

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